Florinef tablets contain the active ingredient fludrocortisone, a type of corticosteroid. This medication is used to treat conditions associated with insufficient production of glucocorticoids by the adrenal glands, such as Addison's disease and congenital adrenal hyperplasia. Additionally, Florinef helps to manage and lower excessively high potassium levels in the blood, a condition known as hyperkalemia. This medication is also marketed under the brand names Floricot and Fludrol, and is prescribed for its mineralocorticoid properties.